Hello; I am using pig 0.9.2 It compiles fine and runs. I can also build my own UDFs. When i try using Piggybank i get an error :
Any help much appreciated Pig Stack Trace --------------- ERROR 1070: Could not resolve org.apache.pig.piggybank.evaluation.string.LOWER using imports: [, org.apache.pig.builtin., org.apache.pig.impl.builtin.] Failed to parse: Pig script failed to parse: <line 2, column 26> Failed to generate logical plan. Nested exception: java.lang.RuntimeException: Cannot instantiate: org.apache.pig.piggybank.evaluation.string.LOWER at org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:178) at org.apache.pig.PigServer$Graph.validateQuery(PigServer.java:1609) at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1582) at org.apache.pig.PigServer.registerQuery(PigServer.java:584) at org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:942) at org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:386) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:188) at org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:164) at org.apache.pig.tools.grunt.Grunt.run(Grunt.java:69) at org.apache.pig.Main.run(Main.java:495) at org.apache.pig.Main.main(Main.java:111) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:156) Caused by: <line 2, column 26> Failed to generate logical plan. Nested exception: java.lang.RuntimeException: Cannot instantiate: org.apache.pig.piggybank.evaluation.string.LOWER at org.apache.pig.parser.LogicalPlanBuilder.buildUDF(LogicalPlanBuilder.java:912) ________________________________ From: James Newhaven <[email protected]> To: [email protected] Sent: Wednesday, April 11, 2012 8:15 AM Subject: Re: Strange behaviour when using FLATTEN Thanks Pablo, That link was really useful. The reason the fieldnames contain NULL, is that I used FLATTEN with TOP, which currently discards the bagname. This is going to be fixed in 0.11 as per https://issues.apache.org/jira/browse/PIG-2365 On Wed, Apr 11, 2012 at 2:55 PM, pablomar <[email protected]>wrote: > this is a very good explanation of flatten: > > > http://ofps.oreilly.com/titles/9781449302641/advanced_pig_latin.html#foreach_flatten > > > > On Wed, Apr 11, 2012 at 9:46 AM, James Newhaven <[email protected] > >wrote: > > > Hi, > > > > Sorry, this is a PIG newbie question... > > > > When I use FLATTEN, I don't understand the structure of the relation that > > is returned. > > > > For example, the following relation A is the result of using flatten: > > > > DESCRIBE A; > > > > A {null::group: chararray,null::tagcount: long} > > > > I'm not really sure why there is "null" prefixing group and tagcount. Can > > anyone help explain what this means? > > > > Thanks, > > James > > >
